Is it incorrect to pronounce it as "ripdof" ? I? make a "doff" situtation there instead of "toff"... ? I do so since I was taught that regular past tense verbs, meaning those that end in -ed, are to be pronounced like that, with a "d"? For example "I needed it" is "did/dit" when I say it and "I founded it" becomes "I foundhuD it". Am I incorrect?

Yes, I? surely remember the last time I got ripped off. My dad needed some antibiotics for an infection. After work I walked into a drugstore in downtown Rio de Janeiro and bought the medicine. I said bought, no I actually got ripped off.